rock cycle
Largest and slowest of the earth's cycles, consisting of geologic, physical, and chemical processes that form and modify rocks and soil in the earth's crust over millions of years.
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Chapter 10 - Geology: Processes, Hazards, and Soils
rock
Any material that makes up a large, natural, continuous part of earth's crust. See igneous rock, metamorphic rock, mineral, sedimentary rock.
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porosity
Percentage of space in rock or soil occupied by voids, whether the voids are isolated or connected. Compare permeability.
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plates
See tectonic plates.
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plate tectonics
Theory of geophysical processes that explains the movements of lithospheric plates and the processes that occur at their boundaries. See lithosphere, tectonic plates.
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permeability
Degree to which underground rock and soil pores are interconnected and thus a measure of the degree to which water can flow freely from one pore to another. Compare porosity.
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organic fertilizer
Organic material such as animal manure, green manure, and compost, applied to cropland as a source of plant nutrients. Compare commercial inorganic fertilizer.
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no-till farming
See conservation-tillage farming.
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Minimum-tillage farming
See conservation-tillage farming.
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mineral
Any naturally occurring inorganic substance found in the earth's crust as a crystalline solid. See mineral resource.
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